One of the great puzzles that keeps neuroscientists busy is the question of how the brain makes distinctions between separate yet similar events, and encodes memories of these. In a Perspective, [Poucet and Save][1] discuss a new study in rats ([ Wills et al. ][2]) that demonstrates how hippocampal place cells of the rat brain abruptly change their electrical representations of slowly changing environments [1]: http://www.sciencemag.org/cgi/content/full/308/5723/799 [2]: http://www.sciencemag.org/cgi/content/short/308/5723/873
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Poucet et al. (2005) studied this question.